Mobile phone arm belt, so far I have seen pretty good, mostly Samsung or fruit, the following factors are my choice of standards, for your reference only:
1. degree of tightness, I can adjust to not fall down or le to red with rage, but also have to consider the mobile phone can be put in or bare metal shell can also be, before I use shell, is a metal frame, also does not take into account...
2. functional, your running under what circumstances, I love running in the gym, and the use of locks, so don't take the key, but occasionally out to see what information, it can touch, but this, it is not for me, see a message or at the neck look, or take off, it is not easy to meet the original. And I will do strength training, tied to the biceps, will be broken, must be tied to the biceps.
3. fabric breathable, sweat, very cheap kind of absorb sweat after completely suffocated, prone to prickly heat, and mobile phone and you don't want to get wet.
4. prices, from a few yuan to tens of dollars have, look at individuals, this is also linked to the brand concept, you if a certain iron powder, is also a lot.